IGCSE Biology Paper-5: Specimen Questions with Answers 44 - 45 of 62

Question 44

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Short Answer▾

There are four types of blood cells are given below (magnified 1000 times) . Identify all four blood samples are related to which organisms.

Image Shows Blood Cells

Explanation

Sample A-Frog blood cells

Sample B-Turtle red blood cells

Sample C-Chicken blood cells

Sample D-Human blood cells

Question 45

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Essay▾

Starch, a complex carbohydrate, is composed of 15 %-20 % amylose and 80 %-85 % amylopectin. It mainly found in rice, wheat, maize.

An experiment was done to identify the presence of starch in potato. What may be the procedure of it?

Explanation

Requirement-

  • Test tubes
  • Test-tube stand
  • Spirit lamp
  • Dropper
  • Filter paper
  • Iodine solution
  • Distilled water

Foodstuff like potato, rice, wheat or maize grains

Procedure-

  • Take a few freshly cut pieces of potato in a clean test tube. Pour 10 ml distilled water into the test tube.
  • Boil the contents of the test tube for about 5 minutes.
  • Filter the contents of the test tube through a filter paper
  • Test the obtained filtrate for the presence of starch by the following method.
  • Then take 2 ml filtrate in a clean test-tube and add 2 drops of iodine solution by dropper

Observation-The color of the filtrate changes dark blue black

Result-It shows presence of starch in potato

Image Shows Test for the Presence of Starch

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